Circuit/System Description

The alternative fuel tank pressure sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and a 5 V reference circuit. The compressed natural gas control module (CNGCM) monitors the signal of the pressure sensor to determine the amount of pressure in the tank. The CNGCM uses this signal in order to calculate the percentage of remaining gas in the tank and converts it to a PWM signal sent to the ECM. The ECM sends the fuel level percentage via the serial data circuit to the instrument cluster in order to control the fuel gauge.